Insulation / Thermal insulation old interior doors old single-family house

  • Erstellt am 2022-08-29 15:23:59

DoctorG

2022-08-29 15:23:59
  • #1
Hello everyone,

The current energy situation also leads to the need to optimize insulation in our case.

Constellation: old interior door with glass inner part (70s style) separates hallway from anteroom. Anteroom (approx. 1.5 sqm) unheated (in front of it an old exterior door with monument protection/not exchangeable for something modern and the usual warping of wood after 100 years). Of course, this results in an unfavorable thermal bridge – and in the hallway area/at this interior door there is a noticeable temperature zone.

For both doors, I would like to achieve better thermal insulation. In the search for thermal resistance values, I noticed that with underfloor heating cork, laminate, and carpet insulate very well. These materials are therefore usually undesirable in such cases. Hence my idea to use this effect to insulate the doors. Especially with the carpet, I would like that I could manage this with rather simple tools like a carpet knife, scissors (instead of a router, circular saw, etc.).
Does anyone have experience with such retrofitted "interior coverings" of doors over the entire surface? Permission is not an issue – the house is owned.
Of course, fasteners like glue, adhesive tape, or screws (I am still undecided) will leave traces if one no longer wants it.

But the core question: is my idea misguided to use these apparently well insulating materials for this purpose?

I myself have not seen this anywhere before. At most, these heavy draft protection curtains. But here I would find something that moves with the door much better than a curtain that I can only reach when standing on one side of the door. On Amazon, there is a solution that somewhat goes in this direction pre-cut (then it looks a bit like a mixture of a psychiatric padded door and a Chippendale sofa), but actually, there is nothing about the material etc. Other ready-made "kits" or solutions I cannot find anywhere either.
And all the joint tapes just solve the joint problem – the thermal bridge at this wavy glass in my opinion cannot be solved with these household remedies.
I also have mixed experiences with the gaps. In the end, these old doors somehow always jam. Perfectly fitting seals that you can buy precisely like for refrigerators are of course nice. As far as I can see, you need accordingly new doors for that. Ours are probably older than the word "order number."
So I would probably prefer for the gaps something like a piece of carpet or roll cork that simply overhangs the gap on one side instead of such a "gap stuffing" with the clamping side effects.

Also here: is that an idea or from a professional point of view something like welding wood?

... please feel free to share ideas that have worked for others. I am not a carpenter/joiner who has seen everything anyway.

Thanks for any feedback.
 

SaniererNRW123

2022-08-29 15:53:48
  • #2
Yes, it is. Because you don't want to apply 20cm of carpet to achieve an insulating effect. Besides, there are much better insulating materials that are just as easy to handle. But as with any insulation, 1cm is really not effective. If anything, simply install a better door. There are special thermal insulation doors for that. They also close tightly.
 

Tolentino

2022-08-29 16:17:15
  • #3

Also considering


?
I don't know if there is an alternative besides installing a second (modern thermal insulation) door behind it. That would probably require reversing the opening direction of the existing door. That won't be easy either.
 

DoctorG

2022-08-29 16:37:27
  • #4
That would actually be quite a lot.
Now I have looked up such a thermal protection door. It seems to be assembled from the door itself, frame, mechanics, etc. Looks complicated – but well, that would be something for a specialist company anyway.
Somewhere over four digits I stopped summing, not even counting the labor. :(

I’m still hesitant because I have this problem in several places in the house.

20 cm would – roughly estimated – be a thickness I wouldn’t even have if I practically screwed a thermal protection door both inside and outside in front of my current poor door. Is there really no alternative to such a large solution, like polyurethane panels or mats?

Does that mean practically all these hallway doors – at least as things stand today, if you don’t want to heat the hallway – are junk?

If that’s the case, then that’s the case, of course. I’m just trying to get used to it. :oops:
 

DoctorG

2022-08-29 16:49:17
  • #5


It really sounds like proper craftsmen and proper work. But it is an interesting thought.
 

SaniererNRW123

2022-08-29 17:01:00
  • #6

That’s just what a door looks like. Can’t be changed. But it was like this even a hundred years ago...

You’re only supposed to replace the interior door. That can’t be such an effort. Leave the outside as is (due to preservation order).

That’s not really surprising, is it?

I don’t understand that. There are front doors that seal a house off from the outside world.
Then there are apartment entrance doors, which close off to a stairwell or similar. They are basically better interior doors.
And finally, there are interior doors that are simply decorative or separate rooms within the house/apartment.

Are you referring to your old interior door to the entrance area? Yes, if they are that old, they’re energetically junk. That’s why normally one installs an energy-efficient front door for the house. Then the rest inside the house is just decoration (see above). Or in your case, you keep the front door and replace the inner door (analogous to apartment entrance door/interior door).

Seriously improving the energy efficiency of a door with small DIY tricks doesn’t work. You have to learn this point. Either do it properly or don’t do it at all. So either spend the money or leave it. Though installing an interior door is a pretty undemanding task.
 

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